Percent Proportions and Percent Bars

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Percent Proportions and Percent Bars

  1. 1. Finding Percents of numbersUsing the Is over Of technique in conjunction with drawing percent bars
  2. 2. What do you think is the answer??• Find 25% of 20• Let’s draw a picture. ? 25% 20 100%
  3. 3. Can you solve this as a proportion?• Find 25% of 20• What would the proportion look like? x 25 ? 25% 20 100 X=5 20 100%
  4. 4. We can do this Mathematically by using a special proportion...just find the following... The Percent – it is the easiest to find. Just look for the % sign! The “Of” number - it is always just behind the word of. The “Is” number - it may or may not be near the “is” word. If you find the other two then what is left is the “is”!
  5. 5. Finding is, of or a Percent is % Use the proportion… of 100 Find the missing number by drawing a bar and using theproportion.a) 15% of 900 is what? x 15 ? 15% 900 100 x = 135 900 100
  6. 6. Finding is, of or a Percent is % of 100Find the missing number by drawing a bar and using theproportion.b) What % of 84 is 63? 63 % 84 100 63 x% X = 75% 84 100
  7. 7. Finding is, of or a Percent is % of 100 Find the missing number by drawing a bar and using the proportion.c) 35% of what # is 7? 7 35% 7 35 x 100 ? 100 X = 20
  8. 8. Finding is, of or a Percent is % of 100Find the missing number by drawing a barand using the proportion.d) 2.5% of 120 is what? ? 2.5% x 2.5 120 100 x=3 120 100
  9. 9. Finding is, of or a Percent is % of 100Find the missing number by drawing a barand using the proportion.60% of 600 is what number? x 60 600 100 x 60% x = 360 600 100
  10. 10. Homework: P. 322 #2-26 evensYou MUST show the proportion and thework you do to get the answer.

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